/* ===== CSS Variables ===== */
:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #10b981;
    --color-accent: #f59e0b;
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    --color-border: #e5e7eb;
    --color-white: #ffffff;
    --color-black: #000000;
    
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-secondary: linear-gradient(135deg, #10b981 0%, #059669 100%);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    --container-max-width: 1200px;
    --container-padding: 1.5rem;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-sans);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul, ol {
    list-style: none;
}

/* ===== Container ===== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
    padding: 0.5rem 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-btn {
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-base);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    width: 24px;
    cursor: pointer;
}

.nav-toggle span {
    width: 100%;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-base);
    text-align: center;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    border: 1px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: var(--color-primary-dark);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 1px solid var(--color-white);
}

.btn-outline:hover {
    background: var(--color-white);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline-white {
    background: transparent;
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-outline-white:hover {
    background: var(--color-white);
    color: var(--color-secondary);
    border-color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    padding-top: 64px;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
}

.stat-item {
    text-align: left;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Phone Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 1s ease 0.3s backwards;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: var(--color-text-primary);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
    transform: rotate(-5deg);
    animation: floatPhone 6s ease-in-out infinite;
}

@keyframes floatPhone {
    0%, 100% { transform: rotate(-5deg) translateY(0); }
    50% { transform: rotate(-5deg) translateY(-20px); }
}

.phone-frame {
    width: 100%;
    height: 100%;
    background: var(--color-bg-primary);
    border-radius: 32px;
    overflow: hidden;
    position: relative;
}

.phone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 28px;
    background: var(--color-text-primary);
    border-radius: 0 0 16px 16px;
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 40px 16px 16px;
    display: flex;
    flex-direction: column;
}

.app-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
}

.app-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.feature-card-sm {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.feature-icon-sm {
    font-size: 1.5rem;
}

.feature-text-sm {
    color: var(--color-white);
    font-weight: 600;
    font-size: 0.875rem;
}

/* ===== Section Styles ===== */
section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

/* ===== Features Section ===== */
.features {
    background: var(--color-bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.feature-item {
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
}

.feature-item h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== How It Works Section ===== */
.how-it-works {
    background: var(--color-bg-secondary);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2xl);
}

.step-item {
    flex: 1;
    text-align: center;
    padding: var(--spacing-xl);
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-white);
    margin: 0 auto var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.step-item h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.step-item p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.step-divider {
    width: 60px;
    height: 2px;
    background: var(--color-border);
    flex-shrink: 0;
}

/* ===== Testimonials Section ===== */
.testimonials {
    background: var(--color-bg-primary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.testimonial-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.testimonial-rating {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.testimonial-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-weight: 700;
    font-size: 0.875rem;
}

.author-info h4 {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 0.125rem;
}

.author-info p {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin: 0;
}

/* ===== FAQ Section ===== */
.faq {
    background: var(--color-bg-secondary);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.faq-item.active {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-base);
}

.faq-question:hover {
    background: var(--color-bg-secondary);
}

.faq-icon {
    transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 var(--spacing-lg);
    color: var(--color-text-secondary);
    line-height: 1.6;
    transition: all var(--transition-base);
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding-bottom: var(--spacing-lg);
}

/* ===== Download Section ===== */
.download {
    background: var(--gradient-secondary);
    color: var(--color-white);
    text-align: center;
}

.download-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.download-content > p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.95;
}

.download-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.footer-brand p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.footer-column a {
    display: block;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-base);
}

.footer-column a:hover {
    color: var(--color-primary);
    padding-left: 4px;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    :root {
        --container-max-width: 960px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .features-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-2xl);
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        padding: var(--spacing-3xl) var(--container-padding);
    }
    
    .hero-content {
        order: 2;
    }
    
    .hero-visual {
        order: 1;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-divider {
        width: 2px;
        height: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .phone-mockup {
        width: 220px;
        height: 440px;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
}